Can you find out the missing number in the grid?

Below the four parts have been reorganised. The four partitions are exactly the same in both arrangements. Why is there a hole?

There are two beautiful yet remote islands in the South Pacific. The Islanders born on one island always tell the truth, and the Islanders from the other island always lie.
You are on one of the islands and meet three Islanders. You ask the first which island they are from in the most appropriate Polynesian tongue, and he indicates that the other two Islanders are from the same island. You ask the second Islander the same question, and he also indicates that the other two Islanders are from the same island.
Can you guess what the third Islander will answer to the same question?

How can one talk without saying a single word?

What Time Should the last watch show in the below figure?

Why 1729 is a magic number? Answer Logically.

Which tank will fill first?

Once while in his court, King Akbar asked Birbal to write something on a wall that makes one sad when read in good times and makes one happy when read in sad times.

He took only a few moment and wrote something that fit the requirements. What did he write?

How many bananas can you eat if your stomach is empty?

Find the next number in the sequence

1, 2, 6, 21, 88, __?